A psychic who can read minds picks up the thoughts of a murderer in the audience and soon becomes a victim. An English pianist gets involved in solving the murders, but finds many of his avenues of inquiry cut off by new murders, and he begins to wonder how the murderer can track his movements so closely.

Movie Tagline:
The maker of "SUSPIRIA" now takes you on a journey through the macabre, the bizarre. . . the unnatural.

Gianna: I think that a woman's gotta be independent so she can... Marc: Oh, don't start with me about all that woman's stuff. It is a fundamental fact... men are different from women. Women are... weaker; well, they're gentler. Gianna: They're what? Weaker? Gentler? [howls in laughter] Gianna: [Gianna stops laughing, stands and moves to the table, pushing things off of it] Marc: What on earth are you doing? [Sitting again and holding her arm up] Gianna: Come on, Tarzan. Why don't you try me? Marc: What's that? Gianna: Indian wrestling.

Carlo: Look, maybe you've seen something so important you can't realize it. Marc: But... I'm just trying to understand, because... Carlo You know, sometimes what you actually see and what you imagine... get mixed up in your memory like a cocktail... from which you can no longer distinguish one flavor from another. Marc: But I'm telling you the truth! Carlo No Marc. You think you're telling the truth, but in fact... you're telling only your version of the truth. It happens to me all the time.

Rodi: Olga! Come back here this minute! [Olga walks back to her father] Olga: What is it? Rodi: You little witch. I told you not to do that again! [Slaps Olga across the face] Rodi: Now off you go- go on! [Olga gives her father an evil smirk as she backs away]

[Back at the car with Marc] Marc: What'd you do? Olga: Nothing. Don't pay any attention; my father's just a little crazy. [At Rodi's feet, a lizard with a pin through it's head, squirming on the ground]

Movie Trivia:

Not all cuts were waived by the BBFC when the film was re-submitted in 2005, following the 11 seconds of cuts made in 1993. On a Dario Argento collection where versions could be chosen (English or Italian) the English version showed a very sloppy cut before the unfortunate lizard was seen on-screen with a pin through its head. The Italian had no such cuts.

The closeup shots of the killer's hands, clad in black leather gloves, were performed by director Dario Argento himself.

In one scene David Hemmings walks past a bar at night. The bar is styled after the famous painting "Nighthawks", by Edward Hopper.